Abstract
Sweeteners improve the dietary properties of many foods. A candidate for a new natural sweetener is 5-ketofructose. In this study a fed-batch process for the production of 5-ketofructose was developed. A Gluconobacter oxydans strain overexpressing a fructose dehydrogenase from G. japonicus was used and the sensory properties of 5-ketofructose were analyzed. The compound showed an identical sweet taste quality as fructose and a similar intrinsic sweet threshold concentration of 16.4 mmol/L. The production of 5-ketofructose was characterized online by monitoring of the respiration activity in shake flasks. Pulsed and continuous fructose feeding was realized in 2 L stirred tank reactors and maximum fructose consumption rates were determined. 5-Ketofructose concentrations of up to 489 g/L, product yields up to 0.98 g5-KF/gfructose and space time yields up to 8.2 g/L/h were reached highlighting the potential of the presented process.
Original language | English |
---|---|
Pages (from-to) | 164-172 |
Number of pages | 9 |
Journal | Bioresource Technology |
Volume | 259 |
DOIs | |
State | Published - Jul 2018 |
Keywords
- 5-Ketofructose
- Fed-batch fermentation
- Fructose dehydrogenase
- Gluconobacter oxydans
- Sweetener